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Related Concept Videos

Active Filters01:25

Active Filters

Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:

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Related Experiment Video

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An Integrated Method for Crafting Flexible and Convenient Electrophysiological Optrodes for Multi-Region In Vivo Recording
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A "Buddy Wire" technique for successful OptEase filter retrieval.

Thomas Pfammatter1, Lukas Hechelhammer, Roger Pfiffner

  • 1Institute of Diagnostic Radiology, University of Zürich Hospital, Switzerland. thomas.pfammatter@usz.ch

Journal of Vascular and Interventional Radiology : JVIR
|March 31, 2009
PubMed
Summary

A novel technique using a buddy guide wire improves OptEase filter retrieval success. This method aids in snaring the filter, increasing overall retrieval rates and successful intended retrievals in vena cava filter placement.

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Area of Science:

  • Vascular surgery
  • Interventional radiology
  • Medical device technology

Background:

  • Inferior Vena Cava (IVC) filters are used to prevent pulmonary embolism.
  • Retrieval of IVC filters can be challenging, sometimes requiring complex procedures.
  • The OptEase filter has a unique dual-umbrella design that can complicate standard retrieval.

Purpose of the Study:

  • To describe a modified technique for retrieving the OptEase IVC filter.
  • To evaluate the efficacy of this technique in patients with difficult filter retrieval.
  • To assess the impact of this technique on overall filter retrieval success rates.

Main Methods:

  • A transfemoral, single-access approach was used.
  • A stiff "buddy" guide wire was threaded through the OptEase filter.
  • This maneuver aligned the filter with the vena cava axis, facilitating hooklet engagement.

Main Results:

  • The technique was successful in 10 patients with previously failed retrieval attempts.
  • In a series of 118 OptEase filters, the overall retrieval rate increased from 72% to 80%.
  • The rate of successful intended retrieval improved from 83% to 93% with this method.

Conclusions:

  • This simple buddy wire technique enhances the retrieval of OptEase IVC filters.
  • It effectively addresses challenges posed by the filter's design, improving procedural success.
  • This method offers a valuable adjunct for interventionalists managing IVC filter retrieval.